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On Panasonic CU ABCKP 5 external fan runs continuously when inside unit off. As electrician, have disconnected actives on external/internal units, fault remains. Any assistance gratefully received.

System started to show this fault recently, not apparent before Sorry, this posted in wrong category, it is an air conditioner !

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  • David Williams
    David Williams Jan 02, 2017

    Units have terminal strip 1-4. On each 1 is Red, 2 Black from 3 core and 3 is Red, 4 is Black from 2 core. My assumption that reds were active was incorrect. 4 on external was 240V hence fan running. Wiring diag needed please.

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OK lets see what we can help you with here. The condensate drain is clogged. There are a couple of ways to clear this clog so lets give it a try. If you know where the drain for the a/c is located outside (usually by the outside condenser unit) it will be a pipe that is just sticking out of the side of the house, if you find it take a wet/dry vac and place it on this pipe and turn the vacuum on and make a seal with your hand this should unclog the drain. If you don't find this pipe outside the house then go to the furnace and you will see at the bottom of the furnace a pipe (PVC) white, this is the drain for the unit inside. Take the wet/dry vac and have it at the ready in the event the clog is further down the line than at the furnace itself now the fittings on this pipe should not be glued together due to the ability to access for this very purpose. Take the pipe apart at one of the fittings and place the wet/dry vac on the end of the pipe towards the furnace and using your hand make a seal and evacuate the line. Do this to both sides since you don't know where the blockage is. If you are unable to separate the pipe at any fitting you will need to cut the pipe and at the spot of the cut you will need to repair it with a sleeve. Remember that the drain pipe is plastic and is made of pvc so you can get a repair coupling from any home improvement store for this repair.
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2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

Tip

What "Protector" means


Quite often a receiver or amplifier will show the message "protection" or "protector". Other times, the unit will return to the standby mode and possibly blink the standby light. This is a protective mode that causes the shutdown of the unit to "protect" it from further damage.

Most modern electronics contain additional circuits that monitor the state of the unit. If a problem is detected, the unit is shutdown and a message of some type is displayed as detailed above. This is done to prevent further damage to either the unit itself or any external speakers or equipment.

Lets determine whether the problem is internal or external:
1) Disconnect any external equipment (speakers are the most common).
2) Power off the unit.
3) Turn it on again (this will reset the protection circuit)

If the protection message clears, the external equipment is the likely cause. Crossed speaker wires is the most common cause. If the unit continues to display the protection message, then the problem is internal and the unit will require service.

The most common internal cause is a failure of the output transistors. These can be easily replaces by an experienced service tech. Some units have complete amplifier sections contained within amp-pacs or large ICs often called STKs. They are so called because the generic part numbers for tehm are often STK-xxx. Panasonic uses large ICs with part numbers that start with SVI as well. If you are experienced with audio repair, a simple check of the transistors and the voltage regulators within the same circuit can often reveal teh cause of the problems.

Hope this helps,

Dan

on Jul 26, 2010 | Audio Players & Recorders

1 Answer

My Panasonic split air conditioner has stopped cooling - model:CU-W18DKR. The internal unit and internal fan operate normally. The external unit fan does not run like normal and no compressor sounds f


Sounds like a faulty outdoor controller board. If you are in Australia, call Prime Electronics or Statewide Appliances for spares.
Part number: NPCWA743383

• To make a diagnosis
1. Timer LED start to blink and the unit automatically stops the operation.
2. Press the CHECK button on the remote controller continuously for 5 seconds.
3. "- -" will be displayed on the remote controller display.
Note: Display only for "- -". (No transmitting signal, no
receiving sound and no Power LED blinking.)
4. Press the "TIMER" or button on the remote controller. The code "H00" (no abnormality) will be displayed and signal will be transmitted to the main unit.
5. Every press of the button (up or down) will increase abnormality numbers and transmit abnormality code signal to the main unit.
6. When the latest abnormality code on the main unit and code transmitted from the remote controller are matched, power LED will light up for 30 seconds and a beep sound (continuously for 4 seconds) will be heard. If no codes are matched, power LED will light up for 0.5 seconds and no sound will be heard.
7. The breakdown diagnosis mode will be canceled by pressing the CHECK button continuously for 5 seconds or without any operation the remote control for 30 seconds.
8. The LED will be off if the unit is turned off or the RESET button on the main unit is pressed.

Or better yet, get a tech to check first.

Feb 10, 2015 | Panasonic Single Split System - Wall...

1 Answer

No heat but fan keeps running


If the air conditioner compressor runs all the time the main control board might be defective. The main control board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.

Nov 25, 2013 | LG LAN186HV / LAU186HV 18,000 BTU 15 SEER...

1 Answer

We have a msz-ga80va split cycle, indoor unit runs for about 5 minutes without cooling then cuts out, outside unit doesn't kick in at all


Just had the same thing happen to us with the same model (right on Xmas day).
Checked the circuit breaker is on in the fuse box. Power is on to the external unit. Filters are clean.
Internal unit activates... both indicator lights on. After 5 minutes blowing air it stops and the right indicator light goes out and the left indicator light blinks constantly.
The troubleshooting guide inside the internal unit (under the outer cover you open to clean the filters) suggests that 14 blinks is an abnormality with the external unit and refer to service manual.
Think we'll be calling a technician.

Dec 26, 2010 | Mitsubishi Heating & Cooling

1 Answer

When switched on the unit displays words EXT-L for about 5 seconds and then switches off. Any ideas please?


Th external link facility had been inadvertently activated. Pressing Ext Link buton on the remote, immediately after switch on cleared the problem and restored normal operation. Disconnecting from the mains and leaving it fo 4 hours had no effect

Mar 09, 2010 | Panasonic Televison & Video

1 Answer

Fan does not turn off even after disconnecting


Are you referring to the fan on the external mechanism, or the internal air handling fan?
The external fan is not controlled by the internal thermostat. it is controlled by the thermos-witch of the compressor. The external fan may or may not run when the motor is operating. it depend totally on the temperature of teh compressor, and not the internal thermostat.
It the internal air handling fan is running continuously,it may be a a problem with the fan setting. check if the fan is set to 'ON' instead of 'AUTO', and correct it.
Incidentally the fan operation I described, is for modern, energy efficient heat systems. This is a energy saving design incorporated in all heating systems including automobile radiator fans.

Jan 31, 2010 | Goodman Heating & Cooling

1 Answer

Panasonic air conditioning model no cu-v9ckp5 inside unit switches on but no fan operation outside unit starts then after approx 1 min whole thing shuts down again


The outside unit has a fan capacitor and it must be faulty!!! thae capacitor tells the fan to rotate and if the fan does not work then the compressor will shut down due to a high head pressure and temperture!! change the capacitor located in the electrical section of the outside unit and it should work fine...

Sep 10, 2009 | Heating & Cooling

1 Answer

Mitshubishi split muh-18nvand inside msh-18nv


-Start the unit.
-Press EMERGENCY OPERATION switch.3-minute time delay works.Test run operation operates for 30 minutes.
-Check voltage to terminal block of outdoor unit.Is there 12V DC between 2-1?
-If voltage is presenet check the wiring, compressor contactor outdoor fan motor and compressor.
-If no voltage check voltage to terminal block of indoor unit.Is there 12V DC between 2-1?
-If if voltage is present re-connect the continuity of indoor and outdoor unit connection.
-If no voltage replace the indoor electronic control P.C.
board.
-But also check the coil thermistor sensor and room air thermistor if this two is out of range it can cause the tripping of out door unit. It has the resistance of 8 to 10 k ohms at 25 deg c temp.
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Jan 04, 2008 | Heating & Cooling

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